Tatemachi, Hachioji, Tokyo, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Tatemachi, Hachioji, Tokyo, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 42 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Tatemachi, Hachioji, Tokyo, Japan
5 AM20th Sep 2025
6 PM
4 AM21st Sep 2025
AQI
AQI
45AQI
26AQI
In the last 24 hours,
Tatemachi's AQI reached its highest point of 45 at 3 AM during the Night, while the lowest point, 26, was recorded at 12 PM during the Night between 20th Sep and 21st Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Tatemachi, Hachioji, Tokyo, Japan
29°C25/34°C
31°C26/36°C
31°C27/36°C
30°C27/35°C
30°C26/33°C
30°C26/36°C
28°C25/31°C
28°C24/33°C
31°C26/36°C
31°C28/35°C
30°C26/36°C
31°C26/36°C
29°C26/35°C
25°C25/25°C
23°C22/24°C
25°C22/30°C
27°C23/32°C
29°C25/34°C
28°C26/32°C
28°C25/31°C
26°C23/29°C
24°C23/25°C
26°C23/29°C
28°C25/32°C
27°C25/31°C
28°C25/31°C
29°C25/34°C
29°C23/36°C
21°C20/22°C
--°C/°C
--°C/°C
45AQI
42AQI
44AQI
42AQI
2025 Days Vs Air Quality
Tatemachi, Hachioji, Tokyo, Japan
90%
237
10%
26
Total number of days with different AQI categories in last 263 days in 2025 (102 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 263 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Tatemachi, Hachioji, Tokyo, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
27AQI
27AQI
24AQI
24AQI
22AQI
28AQI
27AQI
30AQI
27AQI
25AQI
25AQI
25AQI
26AQI
24AQI
28AQI
22AQI
25AQI
25AQI
27AQI
27AQI
30AQI
29AQI
30AQI
35AQI
31AQI
31AQI
25AQI
30AQI
29AQI
27AQI
26AQI
28AQI
29AQI
25AQI
27AQI
28AQI
29AQI
29AQI
29AQI
29AQI
27AQI
28AQI
26AQI
29AQI
27AQI
28AQI
31AQI
33AQI
29AQI
29AQI
29AQI
30AQI
28AQI
32AQI
30AQI
33AQI
33AQI
36AQI
40AQI
45AQI
42AQI
34AQI
29AQI
24AQI
27AQI
29AQI
29AQI
33AQI
31AQI
30AQI
29AQI
34AQI
24AQI
20AQI
17AQI
17AQI
17AQI
15AQI
18AQI
21AQI
26AQI
28AQI
33AQI
49AQI
62AQI
57AQI
37AQI
30AQI
35AQI
28AQI
22AQI
21AQI
18AQI
19AQI
19AQI
14AQI
16AQI
18AQI
17AQI
20AQI
22AQI
20AQI
18AQI
20AQI
19AQI
19AQI
23AQI
27AQI
30AQI
28AQI
23AQI
22AQI
16AQI
16AQI
17AQI
19AQI
19AQI
19AQI
15AQI
19AQI
18AQI
17AQI
16AQI
21AQI
19AQI
19AQI
16AQI
18AQI
18AQI
16AQI
17AQI
20AQI
19AQI
20AQI
23AQI
25AQI
21AQI
25AQI
25AQI
43AQI
43AQI
37AQI
31AQI
30AQI
25AQI
22AQI
20AQI
18AQI
20AQI
20AQI
16AQI
15AQI
20AQI
19AQI
18AQI
23AQI
22AQI
27AQI
30AQI
29AQI
27AQI
27AQI
28AQI
26AQI
24AQI
24AQI
25AQI
31AQI
30AQI
30AQI
28AQI
22AQI
12AQI
14AQI
16AQI
17AQI
16AQI
21AQI
20AQI
24AQI
43AQI
48AQI
53AQI
53AQI
52AQI
56AQI
63AQI
81AQI
81AQI
81AQI
63AQI
49AQI
54AQI
51AQI
40AQI
38AQI
41AQI
39AQI
35AQI
33AQI
34AQI
39AQI
42AQI
47AQI
48AQI
47AQI
42AQI
40AQI
47AQI
47AQI
35AQI
39AQI
35AQI
43AQI
48AQI
59AQI
54AQI
52AQI
46AQI
47AQI
51AQI
38AQI
37AQI
36AQI
35AQI
41AQI
46AQI
47AQI
43AQI
45AQI
47AQI
49AQI
50AQI
51AQI
50AQI
56AQI
58AQI
56AQI
51AQI
48AQI
52AQI
56AQI
54AQI
44AQI
40AQI
37AQI
35AQI
33AQI
30AQI
32AQI
40AQI
43AQI
40AQI
33AQI
34AQI
37AQI
44AQI
43AQI
44AQI
51AQI
50AQI
36AQI
42AQI
27AQI
30AQI
31AQI
20AQI
23AQI
24AQI
49AQI
48AQI
39AQI
No. of days
202532AQI
Highest AQI recorded in
July49AQI
Lowest AQI recorded in
April20AQI
202428AQI
Highest AQI recorded in
June37AQI
Lowest AQI recorded in
January21AQI
202326AQI
Highest AQI recorded in
April37AQI
Lowest AQI recorded in
December19AQI
202231AQI
Highest AQI recorded in
June43AQI
Lowest AQI recorded in
December19AQI
202120AQI
Highest AQI recorded in
June33AQI
Lowest AQI recorded in
February10AQI
202014AQI
Highest AQI recorded in
August27AQI
Lowest AQI recorded in
December10AQI
Most & Least Polluted Years Over the Last 6 Years
Tatemachi's annual 2025 AQI (32) shows an average percentage change of 45.1% (worsened AQI) compared to previous years: 2020 (14), 2021 (20), 2022 (31), 2023 (26), 2024 (28).